Waist exercise device



FIG. 1 is a perspective view of a waist exercise device, showing my new design;

FIG. 2 is a front, elevational view thereof, in an alternated position;

FIG. 3 is a rear elevational view of FIG. 2;

FIG. 4 is a top plan view of FIG. 2;

FIG. 5 is a bottom plan view of FIG. 2;

FIG. 6 is a left side elevational view of FIG. 2; and,

FIG. 7 is a right side elevational view of FIG. 2. 

The ornamental design for a waist exercise device, as shown. 